n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 1 |
6 | 3 |
7 | 6 |
8 | 52 |
9 | 148 |
10 | 1140 |
11 | 2306 |
12 | 30121 |
13 | 48476 |
14 | 478957 |
15 | 1762917 |
16 | 8601630 |
17 | 20789656 |
18 | 268188642 |
19 | 431583572 |
20 | 4685759111 |
21 | 15045763312 |
22 | 86991023001 |
23 | 190548007556 |
24 | 2526401808203 |
25 | 4873374476388 |
26 | 39199367162137 |
[0,0,0,0,1,3,6,52,148,1140,2306,30121,48476, 478957,1762917,8601630,20789656,268188642, 431583572,4685759111,15045763312,86991023001, 190548007556,2526401808203,4873374476388, 39199367162137] |